Take care with fire or heat. Always watch the milk while it is heating.

Materials you need are:

a stove

a saucepan

a wooden spoon

a teaspoon

a strainer

a container

full cream milk

vinegar

paper towel

Warm some milk in a saucepan. When it is just simmering, slowly add a few teaspoons of
vinegar. Keep stirring until the mixture curdles (that is, has lumps in it). Allow it to
cool and then drain off the runny part and keep the 'rubbery' lumps. Let them dry on some
paper towel for a few hours. You have made plastic.

There is a protein called milk casein that reacts with the vinegar to make a form of
plastic.